*{
    margin: 0px;
    box-sizing: border-box;
}
.div_tb{
    width: 900px;
    margin: 0 auto;
}
.tb{
    width: 900px;
    text-align: center;
    margin-top: 30px;
    border: 1px solid black;
}
td{
    border: 1px solid black;
    width: 150px;
    height: 70px;
    font-size: 18px;
}
th{
    font-size: 30px;
    font-weight: 600;
    text-align: center;
    height: 80px;
    background-color: #50a8d9;
}
.p1{
    display: block;
    margin: 20px;
    font-size: 20px;
}